Sheet metal duct



May 25, 1965 J. SZLASHTA SHEET METAL DUCT 2 Sheets-Sheet 1 Filed Aug.16, 1963 INVENTOR. JOSEPH .SZL/ISHTA A TTOR/VE Y May 25, 1965 J.SZLASHTA SHEETMETAL DUCT 2 Sheets-Sheet 2 Filed Aug. 16, 1963 ljZINVENTOR. JOSEPH SZLASHTA 3,185,506 r SHEET METAL DUCT Joseph Szlashta,220 Power Road, Pawtucket, RI.

Filed Aug. 16, 1963, Ser. No. 302,658

4 Claims. ,(Cl. 285-483) This invention relates to'improvements in sheetmetal ducts, such as are employed for conveying heated, cooled it orotherwise conditioned air, smoke or gases, and more particularly to aduct connection which can be slid into and out of operating position.

An object of the present invention is to provide a sheet metal ductconnection betweena furnace and a chimney which can he slid into and outof operating position as the need arises for cleaning the chimney.

Another object of the present invention is to provide interchangeabletakeoff connections which may be united with amain stack connection.

Still another object of the presentinvention is to provide prefabricatedreducing connectionswhich requires .stocking a small number of standardparts.

A further object of the present invention is the provision of a sheetmetal fitting which may be made with p a minimum of waste material.

And still a further object .of the present invention is to provide aseparable takeoff connection or boot and a stack adapter wherein eitherthe boot or stack adapter may be replaced or substituted and-whichrequires no cutting or other fabricating for the substitution.

A further object of the present invention is toprovide interchangeabletakeoff connections and stack adapters which, when combined, constitutea duct of sturdy construction which is not easily collapsed, and whichmay be separated to facilitate storage or transportation.

Other objects of the present invention will become apparent in part andbe pointed out in part in the fol lowing specification and claims.

I In the accompanying drawings wherein like reference characters referto like parts: i i

FIGURE 1 is a perspectivev'iew of the new and im-. proved sheet metalduct. .1

FIGURE 2'is a front elevational view.

FIGURE 3 is a vertical sectional view taken along'line 3-3 of FIGURE 2.

FIGURE 4 is a vertical cross sectional view taken on I line 4-4 ofFIGURE 3. 9

FIGURE 5 is a plan view of the layout of the hood before folding. 7

FIGURE 6is a plan view of the layout of the stack fitting beforefolding.

FIIGURE 7 is a plan view of the'l'ayout of the collar for the hoodbefore folding.

In proceeding with this invention there is provided a hood or boot,generally designatedby reference. numeral 11, and a stack fitting orstack adapter, generally designated by reference numeral 12.

FIGURE 5 is a Hat layout of the body of hood 11 before bending. Foldline 9 indicates where a bead 15 is formed in the front portion of thebody of hood 11 (see FIGURE 3).

The hood consists further of a heel 17 having adjacent side cheeks 18,20. Right. side cheek 18 is provided with a right side neck portion 21having a flap 22. *Left side cheek is providedwith a left side neckportion 23. The edge portion 24,0f right side cheek 18 is separated fromthe edge portion 25 of neck portion 21 by means of a cut 27. Edgeportion 28 of left side cheek 20 is separated from edge portion 30 ofleft side neck portion 23 by means ofcut-31. A rear edge portion 32extends beyond heel 17.

Fold lines 33 indicate the approximate ninety degree ice bend madebetween right side cheek 18 and heel 17. Fold line 34 indicates theapproximate ninety degree bend made between left side cheek 20 and heel17. Fold line 35 indicates the approximate ninety degree bend betweenright side'cheek 18 and right side neck portion 21. Fold line 36indicates the approximate ninety degree bend between left" side cheek 20and left side neck portion 23. Fold line 37 indicates where rear edgeportion 32 is folded upon itself to form guard strip 32A (see FIGURES 1and 3). Fold line 38 indicates where ri ht side edge portion 24 isfolded upon itself to form right side rail 24A (see FIGURES 1, 2 and 4).Fold line 38A indicates where edge portion 25 is folded upon itself toform front rail 25A (see FIGURES 1 and 3). Fold line 40 indicates whereedge portion 28 is folded upon itself to form left side rail 23A (seeFIG- URES 2 and 4). Fold line 40A indicates where edge portion 30 isfolded upon itself to form a left side 'front rail 25A.

FIGURE 7 is a plan layout of a collar 13. Fold or crease lines 7indicate where escalloped edge 14 (see FIGURES 1 and 3) is provided incollar 13. Fold line I 6 indicates where a bead 5 (see FIGURE 3) isprovided in collar 13.

With the folds and bends made as described, supra,

flap 22 will overlie neck portion 23 where fastening will take place;for example by means of rivets as indicated at 42 in FIGURES 2 and 3.Bead 15 will take the round form shown in FIGURES 1, 2 and 3.

Collar 13 (FIGURE 7) will take the round form shown in FIGURES l, 2 and3, and be attached to bead 15 through the projecting edge of bead 5.Rivets 43 will fasten collar 13 in round form around bead 15. 7

FIGURE 6 is a flat layout of the stack fitting 12 before bending andafter the edge is provided with saw shaped teeth, generally indicated byreferencenumeral 45.

The stack fitting 12 is essentially a flat strip provided with aplurality of rectangular cuts vasindicated at 46, 46A, 47, 47A, 48 and48A andan end projection. 49.

Fold lines are indicated at 50, 51, 52,53, 54, 55, 56, 57, 58 and 59.

Surface 60 is folded along line 50 and against surface 61. Surface 61 isfolded along line 51 and over surface 62 to provide pocket 63. Surface64 is bent at ninety degrees to surface 62 along line 52. Surface 65 isbent at ninety degrees to surface 64 and is parallel to surface 62, thebend taking place along line 53. Surface66 is folded under surface 65along line 54. Surface 67 provided with saw teeth 45 is bent at rightangles to surface 66 along line 55. In this manner the front of stackfitting 12 is formed (see FIGURES l, 2 and 3). p

In like manner, surface 76 is folded along line 50 and against surface'71. Surface 71 is folded along line51 and over surface 72 to providepocket 73. Surface 74 is bent at ninety degrees to surface 72 along line52. Surface 75 is bent at'ninety degrees to surface 74 and is parallelto surface 72, the bend taking place along line 53. Surface 76 is foldedunder surface 75 along line 54. Surface 77 provided with saw teeth 45 isbent at right angles to surface 76 along line 55. In this manner theleft side'of stack fitting 12 is formed when the right angle fold alongline 56 is made (see FIGURES 1, 2 and 4).

Surface 80 is folded along line 50 and against surface 81. Surface 81 isfolded along line 51 and over surface 82. Surface 84 is bent at ninetydegrees to surface 82 along line 52. Surface is bent at ninety degreesto surface 84 and is parallel to surface 82,.the bend taking place alongline 53. Surface 86 is folded under surface 85 along line 54. Surface 87provided with saw teeth 45 is bent at right angles to surface 86 alongline 55. In this manner back side, as viewed in FIGURES l and 3,

ares,

of stack fitting 12 is formed when the right angle fold along line 57 ismade.

Surface 90 is folded along line 59 and against surface 91. Surface 91 isfolded along line 51 and over surface 92 to provide pocket 93. Surface94 is bent at ninety degrees to surface 92 along line 52. Surface 95 isbent at ninety degrees to surface 94 and is parallel to surface 92, thebend taking place along line 53. Surface 96 is folded under surface 95along line 54. Surface 97 provided with saw teeth 45 is bent at rightangles to surface 96 along line 55. In this manner the right side ofstack fitting 12 is formed when the right angle fold along line 58 ismade (see FIGURES 1, 2, 4 and 6). End projection 49 is folded along line59 and is fastened to surface 94 as by welding or riveting, as shown at99.

Having shown and described a preferred embodiment of the presentinvention by way of example, it should be realized that structuralchanges could be made and other examples given without departing fromeither the spirit or scope of this invention.

What I claim is:

1. A sheet metal duct consisting of a hood slidably mounted in a stackadapter, said hood consisting of a body of pre-cut flat sheet ofmaterial folded to provide a bead and a heel having a rear edge,adjacent cheeks having neck portions, and side portions and said neckportions having front portions, said adjacent cheeks being parallel toeach other and at approximately ninety degrees to said heel, said neckportions being approximately ninety degrees to said adjacent cheeks, acollar provided with an escalloped edge, means fastening said collar andsaid neck portions together, said rear edge being folded upon itself toform a guard strip, said side portions being folded upon themselves toform opposite and parallel side rails, and said front portions beingfolded upon themselves to form a front rail, said stack adapterconsisting of a pre-cut fiat sheet of material folded to provide arectangular shaped member having saw shaped teeth along a bottom edge, afront pocket and two parallel side pockets, said opposite and parallelside rails being slidably mounted in said two parallel side pockets,said front rail engaging and disengaging said front pocket and saidguard rail overlying a portion of said rectangular shaped member.

2. A sheet metal duct consisting of a hood and a stack adapter, saidhood consisting of a body provided with a bead and a heel having a rearedge, a cheek having a side rail portion and a neck portion, said cheekbeing at substantially a right angle to said heel, said neck portion ina position at substantially a right angle to said cheek, a front railintegrally formed in said neck portion, a second cheek having a siderail portion and a neck portion, said second cheek being atsubstantially a right angle to said heel and substantially parallel tosaid first mentioned cheek, said second mentioned neck portion in aposition at substantially a right angle to said second mentioned cheek,a front rail integrally formed in said second mentioned neck portion,means fastening said first mentioned cheek and second mentioned cheektogether, said stack adapter consisting of a rectangular member having afront side, a left side, a right side and a back side, said left side,right side and front side, each having a saw toothed edge, a lowerpocket at right angles to the saw toothed edge, a separating wallsubstantially parallel to the saw toothed edge, an upper pocketsubstantially parallel to the lower pocket and substantially parallel tothe lower pocket and at substantially ninety degrees to the separatingwall, said back side having a saw toothed edge, a lower pocket atsubstantially right angles to the saw toothed edge, a separating wallsubstantiaily parallel to the saw toothed edge and an upper guardsurface substantially parallel to the lower pocket and at substantiallyninety degrees to the separating wall, said side rails slidinglyengaging, respectively, said upper pockets in said left side and saidright side, said front rail engaging said upper front rail pocket andsaid rear edge overlying said upper guard surface.

3. A sheet metal duct consisting of a hood and a stack adapter, saidhood consisting of a body provided with a bead and having a heelprovided with a right side cheek secured to said heel at substantiallyright angles thereto, and provided with a right side neck portion atsubstantially right angles to said right side cheek, and a right siderail, said right side neck portion provided with a right side frontrail, a left side cheek secured to said heel at substantially rightangles thereto, and provided with a left side neck portion atsubstantially right angles to said left side cheek, and a left siderail, said left side neck portion provided with a left side front rail,means securing said right side neck portion and said left side neckportion together, said stack adapter consisting of a rectangular memberhaving a front side, a left side, a right side and a back side, saidleft side, right side and front side, each having a saw toothed edge, alower pocket at right angles to the saw toothed edge, a separating wallsubstantially parallel to the saw toothed edge, an upper pocketsubstantially parallel to the lower pocket and at substantially ninetydegrees to the separating wall, said back side having a saw toothededge, a lower pocket at substantially right angles to the saw toothededge, a separating wall substantially parallel to the saw toothed edge,and an upper guard surface substantially parallel to the lower pocketand at substantially ninety degrees to the separating wall, said rightside rail slidingly engaging the upper pocket in the right side, saidleft side rail slidingly engaging the upper pocket in the left side,said right side front rail and said left side front rail engaging theupper pocket in the front side, and said guard strip engaging said upperguard surface.

4. A sheet metal duct consisting of a hood and a stack adapter, saidhood consisting of a body provided with a bead and having a heelprovided with a rear edge portion folded upon itself to provide a guardstrip, a right side cheek secured to said heel at substantially rightangles thereto, and provided with a right side neck portion atsubstantially right angles to said right side cheek, and a right sideedge portion folded upon itself to form a right side rail, said rightside neck portion provided with an edge portion folded upon itself toform a right side front rail, a left side cheek secured to said heel atsubstantially right angles thereto, and provided with a left side neckportion at substantially right angles to said left side cheek, and aleft side edge portion folded upon itself to form a left side rail, saidleft side neck portion provided with an edge portion folded upon itselfto form a left side front rail, means securing said right side neckportion and said left side neck portion together, said stack adapterconsisting of a rectangular member having a front side, a left side, aright side and a back side, said left side, right side and front side,each having a saw toothed edge, a lower platform at right angles to thesaw toothed edge, a separating wall substantially parallel to the sawtoothed edge, an upper pocket substantially parallel to the lowerplatform and at substantially ninety degrees to the separating wall,said back side having a saw toothed edge, a lower platform atsubstantially right angles to the saw toothed edge, a separating wallsubstantially parallel to the saw toothed edge, and an edge portionfolded upon itself to form an upper guard surface substantially parallelto the lower platform and at substantially ninety degrees to theseparating wall, said right side rail slidingly engaging the upperpocket in the right side, said left side rail slidingly engaging theupper pocket in the left side, said right side front rail and said leftside front rail engaging the upper pocket in the front side, and saidguard strip engaging said upper guard surface.

(References on following page) 5 v 6 References Cited by the Examiner2,963,783 1 12/60 Field 285-189 X UNITED 7 2,965,397 12/60 Vanden Berg285-424 X 831,429 9/06 Harrington 285-325 X FOREIGN PATENTS 1,516,16911/24 Wilkinson e 126315 5 620,462 5/61 an da, 2,874,980 2/59 Browning285-189 2,950,131 CARL W. TOMLIN, Primary Examiner.

8/60 Hennen 285424 X-

1. A SHEET METAL DUCT CONSISTING OF HOOD SLIDABLY MOUNTED IN A STACKADAPTER, SAID HOOD CONSISTING OF A BODY OF PRE-CUT FLAT SHEET OFMATERIAL FOLDED TO PROVIDA BEAD AND A HEEL HAVING A REAR EDGE, ADJACENTCHEEKS HAVING NECK PORTIONS, AND SIDE PORTIONS AND SAID NECK PORTIONSHAVING FRONT PORTIONS, SAID ADJACENT CHECKS BEING PARALLEL TO EACH OTHERAND AT APPROXIMATELY NINETY DEGREES TO SAID HEEL, SAID NECK PORTIONSBEING APPROXIMATELY NINETY DEGREES TO SAID ADJACENT CHEEKS, A COLLARPROVIDED WITH AN ESCALLOPED EDGE, MEANS FASTINGING SAID COLLAR AND SAIDNECK PORTIONS TOGETHER, SAID REAR EDGE BEING FOLDED UPON ITSELF TO FORMA GUARD STRIP, SAID SIDE PORTIONS BEING FOLDED UPON THEMSELVES TO FORMOPPOSITE AND PARAL-